Delay 5 : The primary measure of the operational efficiency of the airspace system. Delays in the airspace system are the result of congestion and severe weather
United States Department of Transportation, Federal Aviation Administration, Final Environmental Impact Statement: New York/New Jersey/Philadelphia Metropolitan Area Airspace Redesign, Chapter Seven: List of Acronyms, Abbreviations and Glossary of Terms In This EIS, Volume One: Documentation, Washington, DC, USA 2007. http://www.dirtyairport.com/dotnetnuke/LinkClick.a spx?fileticket=bnCberFBJnk%3D&tabid=56&mid=372, (Avn Sfty - Amer) {1015}